aboutsummaryrefslogtreecommitdiffstats
path: root/netlink/librtnl/mapper.c
blob: 65cc13a976e459f4e84d23fb8e1f8d11b9e0b543 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
/*
 * Copyright (c) 2016 Cisco and/or its affiliates.
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at:
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

#include <librtnl/mapper.h>
#include <librtnl/netns.h>

#include <vnet/ip/ip.h>
#include <vnet/ip/lookup.h>

#ifdef ip6_add_del_route_next_hop
#define FIB_VERSION 1
#else
#include <vnet/fib/fib.h>
#define FIB_VERSION 2
#endif

typedef struct {
  int linux_ifindex;
  u32 sw_if_index;
} mapper_map_t;

typedef struct {
  char nsname[RTNL_NETNS_NAMELEN + 1];
  mapper_map_t *mappings;
  u32 netns_handle; //Used to receive notifications
  u32 v4fib_index; //One fib index for the namespace
  u32 v6fib_index;
} mapper_ns_t;

typedef struct {
  mapper_ns_t *namespaces;
} mapper_main_t;

static mapper_main_t mapper_main;

mapper_map_t *mapper_get_by_ifindex(mapper_ns_t *ns, int ifindex)
{
  mapper_map_t *map;
  pool_foreach(map, ns->mappings, {
      if (ifindex == map->linux_ifindex)
        return map;
  });
  return NULL;
}

int mapper_add_del_route(mapper_ns_t *ns, ns_route_t *route, int del)
{
  mapper_main_t *mm = &mapper_main;
  clib_warning("NS %d %s %U", ns - mm->namespaces, del?"del":"add", format_ns_route, route);

  mapper_map_t *map = mapper_get_by_ifindex(ns, route->oif);
  if (!map)
    return 0;

  if (route->rtm.rtm_family == AF_INET6) {

    //Filter-out multicast
    if (route->rtm.rtm_dst_len >= 8 && route->dst[0] == 0xff)
      return 0;

#if FIB_VERSION == 1
    struct ip6_main_t *im = &ip6_main;
    ip6_add_del_route_next_hop(im, //ip6_main
                               del?IP6_ROUTE_FLAG_DEL:IP6_ROUTE_FLAG_ADD,  //flags (not del)
                               (ip6_address_t *)&route->dst[0], //Dst addr
                               route->rtm.rtm_dst_len, //Plen
                               (ip6_address_t *)&route->gateway[0], //next-hop
                               map->sw_if_index, //sw_if_index
                               0, //weight
                               ~0, //adj_index
                               ns->v6fib_index);
#else
    fib_prefix_t prefix;
    ip46_address_t nh;

    memset (&prefix, 0, sizeof (prefix));
    prefix.fp_len = route->rtm.rtm_dst_len;
    prefix.fp_proto = FIB_PROTOCOL_IP6;
    clib_memcpy (&prefix.fp_addr.ip6, route->dst, sizeof (prefix.fp_addr.ip6));

    memset (&nh, 0, sizeof (nh));
    clib_memcpy (&nh.ip6, route->gateway, sizeof (nh.ip6));

    fib_table_entry_path_add (ns->v6fib_index, &prefix, FIB_SOURCE_API,
                              FIB_ENTRY_FLAG_NONE, prefix.fp_proto,
                              &nh, map->sw_if_index, ns->v6fib_index,
                              0 /* weight */,
                              (mpls_label_t *) MPLS_LABEL_INVALID,
                              FIB_ROUTE_PATH_FLAG_NONE);
#endif /* FIB_VERSION == 1 */
  } else {
#if FIB_VERSION == 1
    struct ip4_main_t *im = &ip4_main;
    ip4_add_del_route_next_hop(im, //ip4_main
                               del?IP4_ROUTE_FLAG_DEL:IP4_ROUTE_FLAG_ADD,  //flags (not del)
                               (ip4_address_t *)&route->dst[0], //Dst addr
                               route->rtm.rtm_dst_len, //Plen
                               (ip4_address_t *)&route->gateway[0], //next-hop
                               map->sw_if_index, //sw_if_index
                               0, //weight
                               ~0, //adj_index
                               ns->v4fib_index);
#else
    fib_prefix_t prefix;
    ip46_address_t nh;

    memset (&prefix, 0, sizeof (prefix));
    prefix.fp_len = route->rtm.rtm_dst_len;
    prefix.fp_proto = FIB_PROTOCOL_IP4;
    clib_memcpy (&prefix.fp_addr.ip4, route->dst, sizeof (prefix.fp_addr.ip4));

    memset (&nh, 0, sizeof (nh));
    clib_memcpy (&nh.ip4, route->gateway, sizeof (nh.ip4));

    fib_table_entry_path_add (ns->v4fib_index, &prefix, FIB_SOURCE_API,
                              FIB_ENTRY_FLAG_NONE, prefix.fp_proto,
                              &nh, map->sw_if_index, ns->v4fib_index,
                              0 /* weight */,
                              (mpls_label_t *) MPLS_LABEL_INVALID,
                              FIB_ROUTE_PATH_FLAG_NONE);
#endif /* FIB_VERSION == 1 */
  }

  return 0;
}

static void
mapper_netns_notify_cb(void *obj, netns_type_t type,
                       u32 flags, uword opaque)
{
  mapper_main_t *mm = &mapper_main;
  mapper_ns_t *ns = &mm->namespaces[(u32) opaque];
  ASSERT(!pool_is_free_index(mm->namespaces, (u32) opaque));
  if (type != NETNS_TYPE_ROUTE)
    return; //For now...

  ns_route_t *route = obj;
  if (flags & NETNS_F_DEL) {
    mapper_add_del_route(ns, route, 1);
  } else if (flags & NETNS_F_ADD) {
    mapper_add_del_route(ns, route, 0);
  }
}

void
mapper_delmap(mapper_ns_t*ns, mapper_map_t *map)
{
  ns_route_t *route;
  netns_t *netns = netns_getns(ns->netns_handle);
  pool_foreach(route, netns->routes, {
      if (route->oif == map->linux_ifindex)
        mapper_add_del_route(ns, route, 1);
  });
  pool_put(ns->mappings, map);
}

mapper_map_t *
mapper_getmap(mapper_ns_t*ns, u32 sw_if_index,
              int linux_ifindex, int create)
{
  mapper_map_t *map;
  pool_foreach(map, ns->mappings, {
      if (linux_ifindex == map->linux_ifindex) {
        if (sw_if_index != map->sw_if_index)
          return NULL; //Cannot have multiple mapping with the same ifindex
        else
          return map;
      }
  });

  if (!create)
    return NULL;

  pool_get(ns->mappings, map);
  map->linux_ifindex = linux_ifindex;
  map->sw_if_index = sw_if_index;
  ip6_main.fib_index_by_sw_if_index[sw_if_index] = ns->v6fib_index;
  ip4_main.fib_index_by_sw_if_index[sw_if_index] = ns->v4fib_index;

  //Load available routes
  ns_route_t *route;
  netns_t *netns = netns_getns(ns->netns_handle);
  pool_foreach(route, netns->routes, {
      if (route->oif == map->linux_ifindex)
        mapper_add_del_route(ns, route, 0);
  });
  return map;
}

u32
mapper_get_ns(char *nsname)
{
  mapper_main_t *mm = &mapper_main;
  mapper_ns_t *ns;
  pool_foreach(ns, mm->namespaces, {
      if (!strcmp(nsname, ns->nsname))
        return ns - mm->namespaces;
  });
  return ~0;
}

int
mapper_add_del(u32 nsindex, int linux_ifindex,
               u32 sw_if_index, int del)
{
  mapper_main_t *mm = &mapper_main;
  //ip6_main_t *im6 = &ip6_main;
  mapper_ns_t *ns = &mm->namespaces[nsindex];
  mapper_map_t *map;
  //vnet_sw_interface_t *iface = vnet_get_sw_interface(vnet_get_main(), sw_if_index);

  if (pool_is_free(mm->namespaces, ns))
    return -1;

  /*if (!del) {
    if ((iface->flags & VNET_SW_INTERFACE_FLAG_ADMIN_UP) &&
        im6->fib_index_by_sw_if_index[sw_if_index] != ~0) {
      //A custom fib index will be used...
      clib_warning("Cannot add interface with a custom fib index (current is %d)",
                   im6->fib_index_by_sw_if_index[sw_if_index]);
      return -1;
    }
  }*/

  if (!(map = mapper_getmap(ns, sw_if_index, linux_ifindex, !del)))
    return -1;

  if (del)
    mapper_delmap(ns, map);

  return 0;
}

int
mapper_add_ns(char *nsname, u32 v4fib_index, u32 v6fib_index, u32 *nsindex)
{
  mapper_main_t *mm = &mapper_main;
  mapper_ns_t *ns;
  if (mapper_get_ns(nsname) != ~0)
    return -1; //Already exists

  pool_get(mm->namespaces, ns);
  strcpy(ns->nsname, nsname);
  ns->v4fib_index = v4fib_index;
  ns->v6fib_index = v6fib_index;
  ns->mappings = 0;

  netns_sub_t sub;
  sub.notify = mapper_netns_notify_cb;
  sub.opaque = (uword)(ns - mm->namespaces);
  if ((ns->netns_handle = netns_open(ns->nsname, &sub)) == ~0) {
    pool_put(mm->namespaces, ns);
    return -1;
  }
  *nsindex = ns - mm->namespaces;
  return 0;
}

int
mapper_del_ns(u32 nsindex)
{
  mapper_main_t *mm = &mapper_main;
  mapper_ns_t *ns = &mm->namespaces[nsindex];
  if (pool_is_free(mm->namespaces, ns))
    return -1;

  //Remove all existing mappings
  int i, *indexes = 0;
  pool_foreach_index(i, ns->mappings, {
    vec_add1(indexes, i);
  });
  vec_foreach_index(i, indexes) {
    mapper_delmap(ns, &ns->mappings[indexes[i]]);
  }
  vec_free(indexes);

  netns_close(ns->netns_handle);
  pool_put(mm->namespaces, ns);
  return 0;
}

clib_error_t *
mapper_init (vlib_main_t * vm)
{
  mapper_main_t *mm = &mapper_main;
  mm->namespaces = 0;
  return 0;
}

VLIB_INIT_FUNCTION (mapper_init);